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var jQuery = function(global, factory) {
    return new jQuery.fn.init();
}

jQuery.fn = jQuery.prototype = {
    constructor: jQuery,
    init: function() {
        this.jquery = 3;
        return this;
    },
    each: function() {
        console.log('each');
        return this;
    }
}

jQuery.fn.init.prototype = jQuery.fn;

// init構(gòu)造函數(shù)
jQuery().each().each()

The above is a piece of jQuery source code. My question is why the second each function in the last line of the code can still be executed